java使用Timer类实现操作超时报警

public Map getmanyMdatabystationanddate(@RequestBody Map<String,Object> params){
        Timer timer = new Timer();
        Map res =new HashMap<>();
        timer.schedule(new TimerTask() {
            @Override
            public void run() {//这里相当于延迟30000ms执行此程序
                flag = 1;
                timer.cancel();//关闭线程
            }
        },30000);
        Map map=mDataService.getmanyMdatabystationanddata(params);
        System.out.println("flag:"+flag);
        if(flag==0){
            return map;
        }else {
            Map mapTimeout=new HashMap<>();
            mapTimeout.put("queryFlag","timeout");
            return mapTimeout;
        }
    }